CMF551K3700FKBF Equivalent & Substitute Parts

Part Overview

The CMF551K3700FKBF is a 1.37 kOhms ±1% metal film through-hole resistor rated at 0.5W (1/2W) in axial package configuration. Manufactured by Vishay Dale, this component features flame retardant coating and moisture-resistant properties suitable for industrial and commercial applications. The part is currently active in production. Substitute parts may be required due to packaging format availability, compliance requirements, or inventory constraints across different distribution channels.

Substiute Parts

CMF551K3700FKBF

Vishay DaleIn Stock: 972CMF551K3700FKBF Datasheet

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CMF551K3700FHEB

Vishay DaleIn Stock: 3197CMF551K3700FHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution between CMF551K3700FKBF and CMF551K3700FHEB is valid based on the following criteria:

Electrical Parameters (Identical):

• Resistance value: 1.37 kOhms
• Tolerance: ±1%
• Power rating: 0.5W (1/2W)
• Composition: Metal Film
• Operating temperature range: -55°C to 175°C
• Physical dimensions: 0.090" Dia x 0.240" L (2.29mm x 6.10mm)

Mechanical Parameters (Identical):

• Package type: Axial
• Number of terminations: 2
• Features: Flame Retardant Coating, Moisture Resistant, Safety

Allowed Variation:

• Temperature coefficient: CMF551K3700FKBF (±100ppm/°C) vs. CMF551K3700FHEB (±50ppm/°C) — the substitute exhibits superior temperature stability
• Packaging format: Bulk vs. Cut Tape (CT) — distribution format only, does not affect component performance

Parameter Comparison

Engineering Selection Recommendations

CMF551K3700FKBF (Bulk Packaging): Use when bulk quantities are required for high-volume manufacturing or when existing designs specify this exact part number. Verify RoHS and REACH compliance requirements for your application before selection.

CMF551K3700FHEB (Cut Tape Packaging): Select this substitute when ROHS3 compliance is mandatory or when REACH-unaffected status is required for your end application. The improved temperature coefficient (±50ppm/°C vs. ±100ppm/°C) provides enhanced stability in temperature-sensitive circuits. Cut Tape packaging is suitable for automated assembly processes and smaller production runs.

Both parts are electrically and mechanically interchangeable within the specified parameters. Selection should be based on compliance requirements, packaging format needs, and inventory availability.

Frequently Asked Questions (FAQ)

Q: Are CMF551K3700FKBF and CMF551K3700FHEB electrically identical?

A: Yes. Both parts have identical resistance (1.37 kOhms), tolerance (±1%), power rating (0.5W), composition (metal film), and operating temperature range (-55°C to 175°C). The substitute features a superior temperature coefficient (±50ppm/°C vs. ±100ppm/°C).

Q: What is the difference between Bulk and Cut Tape packaging?

A: Bulk packaging is loose components suitable for manual assembly or large-quantity storage. Cut Tape (CT) packaging provides components on continuous tape, optimized for automated pick-and-place assembly equipment. Both formats contain identical components.

Q: Can I use CMF551K3700FHEB as a direct replacement in existing designs?

A: Yes. The substitute is mechanically and electrically compatible. Physical dimensions, pin configuration, and electrical specifications are identical. Verify that improved RoHS3 compliance and REACH-unaffected status align with your application requirements.

Q: Does the temperature coefficient difference affect circuit performance?

A: The substitute's lower temperature coefficient (±50ppm/°C) indicates superior stability across temperature variations. For most applications, this represents an improvement. For circuits with tight tolerance requirements, verify that the original design specifications do not mandate the higher coefficient value.

Q: Which part should I specify for new designs?

A: CMF551K3700FHEB is recommended for new designs due to ROHS3 compliance and REACH-unaffected status, which align with current regulatory requirements. Confirm compliance needs for your specific application and end market.